module Metricize::Stats
Public Instance Methods
calculate_percentile(percentile)
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# File lib/metricize/stats.rb, line 22 def calculate_percentile(percentile) return self.first if self.size == 1 values_sorted = self.sort k = (percentile*(values_sorted.length-1)+1).floor - 1 values_sorted[k] end
mean()
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# File lib/metricize/stats.rb, line 8 def mean return self.sum / self.length.to_f end
sample_variance()
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# File lib/metricize/stats.rb, line 12 def sample_variance m = self.mean sum = self.inject(0){|accum, i| accum + (i - m) ** 2 } return sum / (self.length - 1).to_f end
standard_deviation()
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# File lib/metricize/stats.rb, line 18 def standard_deviation return Math.sqrt(self.sample_variance) end
sum()
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# File lib/metricize/stats.rb, line 4 def sum return self.inject(0){|accum, i| accum + i } end